Add S1000 corpus

## Adding a Dataset
- **Name:** S1000
- **Description:** The S1000 corpus is a comprehensive manual reannotation and extension of the S800 corpus that allows highly accurate recognition of species names, both for machine learning and dictionary-based methods.
- **Task:** NER
- **Paper:** https://academic.oup.com/bioinformatics/article/39/6/btad369/7192170?login=false
- **Data:** [https://jensenlab.org/resources/s1000/](https://jensenlab.org/resources/s1000/)
- **License:** Creative Commons Attribution 4.0 International